Builder motion for spinning and twister frames



Sept. 15, 1942. EEDFQRS BUILDER MOTION FOR SPINNING AND TWISTER FRAMES Filed Sept. 12, 1939 5 Sheets-Sheet 1 Sept. 15, 1942. s. E; EDFORS BUILDER MOTION FOR SPINNING AND TWISTER FRAMES Filed Sept. 12-, 1959- s Sheets-Sheet 2 a a l v inml III/II INVENTOR S. E. EDFORS Sept. 15, 942.

\ BUILDER MO'IION FOR SfINNING AND TWISTER FRAMES Filed Sept. 12, 1939 5 Sheets-Sheet 3 INVENTOR ATTORNEY Sept. 15, 1942. s. E. EDFORS 2,295,

BUILDER MOTION FOR SPINNING AND TWISTER FRAMES Filed Sept. 12, 1939 5 Sheet sSheet 4 INVENTOR ATTORNEY4 'gmt, 15, 1942. s. EEDFORS ggsfiw BUILDER MOTION FOR SPINNING AND TWISTER FRAMES iled Sept. 12, 1959 5 Sheets-Sheet 5 Z /A/VENTOR.'

Patented Sept. 15, 19 42 BUILDER MOTION FOR SPINNING TWISTED. FRAMES Sven E. Ediors, Saco, Maine, assignor to Saco-- Lowell Shops, Boston, Mass, a corporation of Maine Application September 12, 1939, Serial No. 294,474 Claims. (01. 242-43.?)

This invention relates to spinning and twister frames and other machines designed to produce yarn or thread packages. For convenience such machines will be hereinafter included in the term twister frames. The invention is more especially concerned with they builder motions of machines of this type. As is well understood by those skilled in this art, this term designates the mechanism which-controls the winding of the thread or yarn on the bobbon, spool, tuba-or other core for supporting the thread body, and

it determines the distribution of the thread and,

consequently, the shape of the completed package.

In producing fine. count yarns, especially those composed of viscose, cellulose acetate, or other synthetic fibers, and winding them on a core to produce a yarn package suitable for subsequent use in fabricating machines of thevarious types employed in the textile industry, it has been found that those mechanisms which operate satisfactorily with cotton yarn give a great deal of trouble inhandling these smooth, slippery, synthetic yarns. This is particularly true in attempting to build the large yarn packages or thread bodies which are now generally required by the textile industry.

Av common formof yarn package. much demanded by the trade has a tapered top to facili-' tate thewithdrawal of the yarn over the end.

In using packages of this kind a serious diflieulty has been the tendency for the layers, turns, or

coils of yarn to sluii of! during withdrawal of the yarn, thus producing a snarl which may necessitate a shut-down.

It has been proposed heretofore to overcome these dimculties by building a yarn package including a core orbobbin having upperand lower heads, the latter being considerably larger in diameter than the former. Yarn is wound on this body in a straight wind untila' cylindrical yarn body has been built up approximately equal to the diameter ofthe upper bobbin head.

Thereafter the wind is changed throughout approximately the upper third of the yarn body, the traverse being progressively decreased in height 'and then correspondingly increased, and these progressions or cycles aregrepeated until theyarn body has attained the desired diameter. During this operation the rail speed preferably is maintained constant, but the effect of the varying heights of-the layersis to produce a packageshaving such a taper that the thread body will be self-sustaining and free from slufling during the operation of unwinding.

It is the chief object of this invention to devise a builder motion and a controlling appa-. ratus'therefor of such a nature that yarn bodies of similar character can be built automatically and'at a high rate of production; Some features of the invention also will be found useful in making yarn bodies of other forriis.

The nature of the invention will be readily understood from the following description when read in connection with the; accompanying drawings, and the novel features will heparticularly pointed out inthe appended claims.

In the drawings, 1

Figure 1 is a side view, somewhat diagrammatic in character, of a portion of a twister frame adjacent to the head end thereof, the machine being equipped with a builder motion embodying this invention;

Fig.2 is a vertical, sectional view longitudinally of the builder arm;

Fig. 3 is a side view, partly in section, showing diagrammatically the general nature of the yarn packages produced by this machine:

Fig. 4 is a vertical, transverse, sectional view through the frame shown .in Fig. 1, illustrating parts of the builder motion;

Fig. 5 is a plan view of those parts mounted at the left-hand end, Fig. 2, of the builder arm;

Fig. 6 is a, perspective view of certain parts of this mechanism;

Fig. 7 is an end view of one of the parts shown 'in Fig. 6;

Fig. 8 is a side view of the mechanism shown in Fig. 5;

Fig. 9 is an end view of said mechanism; Fig. 10 is a wiring-diagram; and.

. Fig. 1i is a diagrammatic view on a large scale showing details of the package wind above referred to.

Referring first to Figs. -1 and 4, the machine shown comprises a spindle rail 2 and a ring rail 3, the former carrying a series of spindles 4 adapted to support bobbins or other cores on which the yarn is wound. The vertical traversing movement of the ring rail required for this purpose is produced by a builder motion including the usual cam 5 cooperating with a pitman roll 6 onthe builder arm I which is pivotally connected at 8 to the machine frame. llounted in a curved guidewayin the arm I isa rack ll slidably adjustable along said guideway. A chain It connects thisrack with an arm I! secured to a rock shaft at I! to which is fastened another arm I! for operating the lifter rod l3. Similar arms are provided at various points along the frame to operate other lifter rods which unitedly support the ring rail 3.

So far as the mechanism above described is concerned, it is essentially like those commonly used in twister frames. 7

As above stated, the thread body T, Figs. 3 and 11, includes a central cylindrical portion a p oduced by a straight or spool wind. During the building of this part of the yarn body, the

rack 10 remains in the position shown in Fig. 2, and the builder motion operates in the well known manner, successive layers beingwound one upon the other and the ring rail traversing the entire length of the yam body. The present invention provides a pick mechanism which is brought into action automatically at the conclusion of this stage of the building operation and which so changes the wind as to produce the part A, Figs. 3 and 11, of the yam package. The first efiect of this change is to gradually shorten successive traverses. Next the traverses are gradually increased in height, and this cycle is repeated until the building of the thread body has been completed.

Such gradual shortening of the traverse is ac complished by moving the rack 10 step by step toward the right, Fig. 2, until a predetermined 4 minimum length of traverse has been produced. Then the rack is similarly moved step by step toward the left until it has returned to its'initlal position. And thesefunctions are performed by I a novel pick mechanism which forms an important feature of this invention.

Referring more particularly to Fig. 2, it will be seen that a worm l4 meshes with the rack l rotation can be reversed while the mechanism remains in its operative position in the machine.

Each rotativemovement .of the wheel 16 is transmitted to the worm l4, Fig. 2, through a clutch comprising teeth b on the left-hand end of the worm, and cooperating teeth on the opposing end of a clutch sleeve 24, mounted to rotary motion of the latter to the worm I 4, but can be moved to release the clutch. Since'the successive movements of theratchet 'wheel It in one direction operate through these connections with the rack I II to move it toward the pivot 8 of the builder am, they progressively lower the upper limit of the ring rail traverse, while a reversal of these adjusting movements has the opposite eifect.

The wheel I6 is sufllciently large in diameter to I hold the pawl normally out of contact with the teeth of the ratchet wheel l8. 'However, the former is provided with one notch d, Fig. 9, of

suilicient depth to permit the end of the pawl to and is mounted looselyion a worm shaft 15 supported in suitable bearings in the builder arm I. At the left-hand end of this shaft a ratchet wheel l6, Figs. 2, 5, 8 and 9, is keyed thereto and is adapted to be operated by a double acting pawl l1. Mounted immediately beside the ratchet wheel I6 is another ratchet wheel I8 of smaller diameter, turning loosely on the stationary bearing bushing 20, Fig. 2, and backed up by a friction washer 2 I. A divided spring 22 is interposed between the two ratchet wheels and applies suilicient friction to both wheels to prevent them from rotating except when operated by the pawl II. The spring is held stationary on the sleeve or bushing 20. The pawl I1 is pivotally mount-' ed on a lever 23, supported on the bushing 20, and the left-hand end, Figs. 1 and 9, of this lever is arranged to engage upper and lower stops I24 and I25 secured on the frame of the machine, as the builder arm approaches, respectively, the upper and lower limits of its swing. The

stops are vertitally adjustable. Assuming that. the pawl is tipped, as' shown in Fig. 9, engagement of the swing lever 23 with the upper stop I24 on the upward swing of the builder arm will cause the pawl to move the ratchet wheel it one tooth in a counter-clockwise direction, while the corresponding engagement of the lever with the lower stop on the downward swing of the builder arm will move the pawl downwardly over the 'next tooth where it willdrop in behind it. When the position of the pawl is reversed, as will presently be described, the operations also are reversed .and the pawl then rotates the ratchet wheel lli in a clockwise direction.- In other words, this is a. reversible pawl and ratchet mechanism. The term reversible pawl and ratchet mechanism" or other reversible mech- Y anism is used hereinafter in the claims to designate a mechanism in which the direction of and thus to actuate it.

number of picks of drop in behind one of the teeth of the wheel l8 each revolution ofthe wheelll6, 'and this arrangement is utilized both to; predeterminej the maximum adjustment of the-{ranch made by the pick mechanism in a giveh cyclep'and also to effeet the reversal bf that, movement. For this purpose the wheel l8 has-reversing lugs 21 and 28, Fig. 9, secured to it, these lugs being adjustable circumferentially of the wheel into any de-' sired position so that when a predetermined the wheel l6 have been made in a counter-clockwise direction, the lug 21 will strike the trip lever 30 upon the next pick and reverse the position of the pawl I]. This is accomplishediby mounting the trip lever securely on the pawl pivot 3|, Figs. 5, 6, 7 and 9,

and grooving the latter, as shown in Fig. 6, to provide" a rib 32 of inverted V-shape in crosssection. A spring pressed ball 33, Fig. 5, is positioned to engage said rib. As the reversing lever 30 is moved by either lug 21 or 28 through an intermediate central position, the ball is forced from the bottom of one groove up the inclined surface of the rib 30 and slightly to the other side thereof, whereupon its pressure on the latter side completes the shifting movement ofthe pivot and consequently of the pawl ll fastened to ,it. This reverses the adjusting movement of the worm I4 and consequently of the rack Ill. Rotative movement of the .wheel It in the new direction continues until one of the reversing lugs on'the wheel I8 again strikes the lever 30 and shifts the pawl l'l into its opposite position. Considering this adjustment of the rack in one directionandthen back to its initial position as one cycle, these cycles will be repeated automatically until the machine is,

stopped. 1 It should be noted that the adiusting movements just described affect only the upper portion of the traverse of the ring rail. As indicated in Fig. 4, this rail i at the lower limit of its traverse when the poll... of the cam-5 is in engagement with the pitman roll 6. The guideway in the builder arm in which the slide [0 operates is curved in an are having a center located at the upper edge of the guide roll 34, Fig. 4, over which the chain H .runs. Consequently, any

The sleeve 24 This occurs only once in ;durlng the adjustment of this slide has no eflect on the lower limitof traverse oi the ring rail, but any such adjustment does aifect the .upper limit of the traversing movement because the builder arm I at that time has swung upwardly out of the horizontal position in which it is shown 'in Fig. 4 and any change in the distance between the anchoring point of the chain II to the slide and the pivot point 8 aflects the height to which the ring rail is allowed to rise. In this machine the cam 5 acting on the pitman roll 5 positively produces the downward movement of the ring rail, and its upward movement is produced primarily by weights one of which is shown at 35, Fig. l, but under the centroid the cam 5.

As above stated, the pick mec out of action during the building of the central cylindrical portion of the yarn body. For this purpose a pawl shield 36, Figs. 5. 6 and 8, is pivoted at on the lever 23, and'is equipped with a V-shaped cam 39, best shown in Fig. 6,

is held 10, in the builder arm 1 to hold the circuit of the solenoid 4| closed and thus to maintain the'pawl shield 86 in its operative position where it holds the pawl I! out of action.

when a predetermined yardage has been wound on each spool, as indicated by the counter 50, the

builder clock switch 56 opens, thus deenergizing the magnet or solenoid ll, whereupon the shield 38 is swung into its inoperative position by the spring 0. Fig. 5. The parts are so biased that whenever the pawl pivot it is freed from the restraint of its shield 36, the spring pressed ball 33 acts on the pivot to tip the pawl H in a counterclockwise direction and into'the position shown adapted to enter a notch 3| formed in the end of the pawl pivot 3|. A leaf spring 40, Fig.5, acts on this shield in a direction tending to hold it out of contact with the pivot, but an electro-magnetically controlled mechanism is provided to hold this shield in its operative or' pawl lockingposition. As best shown in Figs. 4, 5 and 8, this mechanism comprises a solenoid or electromagnet 4| mounted in the builder arm I, a lever 42 pivoted to the plunger of said electro-magnet, a link 0 connecting said lever with one arm of a bell crank lever 44, Fig. 5, and a link 45 connecting the other arm of the bell crank lever to a shield operating lever. 48. When the solenoid is energized it operates through these connections to swing the shield in a clockwise direction,

Fig. 5, at which time the cam 39 enters the notch II and locks the shield in its operative position. Upon deenergization of the magnet its plunger is ejected by a spring and the parts are returned to the positions in which they appearin Fig. 5.

The cam 39, Fig. 6, is so related .to the walls of of the v-shaped notch a that as the shield swings into its operative position the cam acts on said walls to rock the pivot 3| into a central position where it holds the pawl I! in an idle or neutral condition, both of its ends being out of contact with the teeth of the wheel Ii. Conse-' quently, so long as the parts are held in this relationship the pick mechanism remains idle, even thoughthe-lever 23 continues to be operated by its engagement with the stops Ill and I".

A general control of the builder mechanism-is provided by an electrical apparatus comprising two yardage counters or so-called "clocks indicated, respectively, at II and ill, Figs. 4 and 10.

The former controls a relay switch which, in turn,

controls the motor for driving the spinning frame,

and such control is exercised through a switch ii with which the counter 48 is eq ipped. Normally, or when the twister frame is in operation, this switch is closed and holds the motor controlling switch (not shown) in its closed'position.

This circuit, however, is also controlled by a manually operated switch I! equipped with the usual starting button I: and stop button I4. Such controlling circuits are well known in the art so that a detailed illustration of them is not 11 are The yardage counter I, or so-calledbullder clock, includes a switch which remains closed building ofthe cylindrical portion a. Fig. 3, of the thread body '1, and during this period it cooperates with another switch n, Fig.

in Fig. 9. Inthis relationship the pawl moves the ratchet wheel 16 step by step in a counterclockwise direction and therefore rotates the sleeve N in a direction tending to move the rack toward the left. Figs. 2 and 4. However, throughout the building of the straight wound portion a of the thread body. the rack Ill is held in its extreme left-hand position against the stop -59. In this position the chain hook 6| bears against the lever 02 and holds the clutch sleeve 24 so far toward the left that its teeth slip over the s cooperating teeth on the worm hub with the result that the worm l4 and rack l0 remain stationary. The pawl continues to move the ratchet wheel I in a counter clockwise direction, without imparting'motion .to the worm-or the rack, until its action is reversed by the lug 21 striking the lever ll, as above explained. The purpose of this idle operation of the pawl and ratchet mechanism is to'correlate the position of the' reversing lug 21 with the position of the rack In. As soon as the operation of the ratchet mechanism is reversed, it operates through the worm l4 to move the rack ll step by step towardthe fulcrum l of the builder arm, thus shortening successive traversing movements of the latter, and the pick mechanism thereafter continues to operate normally throughout'the building of the variable traverse volume A of the thread body. When this operation has been completed the main yardage counter or motor control clock 48 opens its switch II and shum down the operation of the machine.

In this connection it may be pointed out that during the building of the vari-piek portion-A of the thread body T shown in Figs. 3 and 11,

successive traverses may be initially stepped down or shortened'by relatively short distances say, for example, a quarter of an inch, until a certain minimum length of traverse is reached. Thereafter they are increased orlengthened in steps of approximately the same height until the traverse extends the entire height of the thread body. And thesecycles are-repeated throughout the building of the'portio'n A. Figs. 3 and 11 show a typical form of thread package made in accordance with the invention, but the stepping of successive layers of yarn is shown merely diagrammatically, it being understood that in a commercial package of typical dimensions and sizes of yarn there will be hundreds of thesestepped courses or layers of threads.

Because the machine may be stopped with the rack II in some intermediateposition, and it is necessary for the building of these thread bodies that the'rack shall be at the extreme left-hand end', Fig. 2, and against the stop '59 throughout the winding of the first part a of the yarn package, the end portion I of the shaft I5 is squared, as shown in Fig. 5,Ito receive a hand crank by means of which this readjustment or winding backof the rack can be performed. Mea

however, is also provided to perform this operation automatically.

As above pointed out, the solenoid II is de-' energized at the time the main yardage clock 48 opens the switch and thus shuts down the motor. This occurs at the completion of the wind and at a time when the switches 56 and 5'l'are open and the pick mechanism, accordingly,

is in operation. After the operator has com- .pleted the doll in the usual manner and is ready to start up the machine again, he resets both clocks and then pushes the starting button 53.

Consequently, when the frame starts up, the pick mechanism immediately begins to operate. In

completing its own cycle ofoperations in which the switch 51 due tothe action of the spring 25.

This switch normally is held open by said spring and the parts 84 and 65 but is closed by the slight lifting movement of the screw 65 and the consequent release of the button 68 when the lever I is operated as just described. Thus at this time the switch closes the circuit of the solenoid 4!, the clock controlled switch 58 having already been closed by the resetting operation. Hence the solenoid is again energized, and the pawl shield 36 is brought intoits operative position, thus throwing the pick mechanism into neutral. It is held in this condition until again brought into action by the opening of the builder clock switch 56 at the completion" of the winding of the cylindrical portions of the thread bodies on the coresplaced on the spindles at the previous doif.

With this invention, therefore, the machine automatically goes through its cycle of operations after it has once been started up, making thread packages of the character abovedescribed, and then shutting down automatically when the packages have been completed. Since the building of such packages occupies several hours when a thread of fine gauge is used, the invention effects an'important reduction in the time and attention which such machines require.

It will also ,be evident to those skilled in this art that while I have shown and described a preferred embodiment of my invention, the invention is, nevertheless, capable of embodiment in other forms without departing from the spirit or scope thereof. Also, that while the invention is herein disclosed as embodied in a twister frame of a common form, it is applicable to other 1 machines in which it is desirable to operate a traversing rail in a similar manner,

Having thus described my invention, what I desire to claim asnew is:

L A' builder motion for operating the traversing rail of a twister frame comprising a pivoted builder arm, means for operatively connecting said arm with said rail including a member ad justable lengthwise of said arm to change: the length of traverse of said rail,- a rotary element for producing adjusting movements of said member along said arm in opposite directions, and

to move said member along said arm, said mechanism including a rotarydrivingdevice andmeans for automatically reversing the direction of rotation of-said driving device at predetermined intervals and thereby producing adjusting movements of said member in oppositedirections.

2. A builder motion for operating the traversing rail of a twister frame comprising a pivoted builder arm, means for operatively connecting said arm with said rail including a member adjustable lengthwise of said arm to change the length of traverse of said rail, a rotary element for producing adjusting movements of said member along said arm in opposite directions, and mechanism arranged to be reversely operated by the motion of said arm for rotating said element step by step first in one direction and then in the opposite direction.

3. A builder motion for operating the traversing rail of a twister frame comprising a pivoted builder arm, means for operatively connecting said arm with said rail including a member ad- Justable lengthwise of said arm to change the length of traverse of said rail, a rotary element for producing adjusting movements of said member along said arm in opposite directions, mechanism for rotating said element step by step to move said member along said arm, said mechanism including a rotary driving device and means cooperating with said mechanism to reverse the direction of rotation of said driving device at predetermined intervals and thereby reversing the movement ofsaid member along said arm.

4. A builder motion for operating the traversing rail of a twister frame comprising a pivoted builder arm, means for operatively connecting said arm with saidrail including a slide adJusta-' ble lengthwise of said arm, a reversible pawl and ratchet mechanism mounted on said arm, said mechanism being adapted to be driven in opposite directions at will while it remains in its operative position in the machine and means arranged to be operated by said pawl and ratchet mechanism and connected with said slide for mechanism for rotating said element step by step adjusting the slide first in one direction and then in the opposite direction on said arm.

5. A builder motion for operating the traversing rail of a twister frame comprising a pivoted builder arm, means for operatively connecting said arm with said rail including a slide adjustable lengthwise of said arm, a reversible pawl and ratchet mechanism mounted on said arm, means arranged to be operated by said pawl and ratchet mechanism and connected with said slide for adjusting the slide first in one direction and then in the opposite direction on said arm, and means mounted on said arm operable to throw said pawl and ratchet mechanism into and out of action. v

6. A builder motion for operating the traversing rail of'a twister frame comprising a pivoted builder arm, means for operatively connecting said arm with said rail including a slide adjustable lengthwise of said arm, a reversible pawl and ratchet mechanism 'electro-magnetically actuated means mounted on said arm and operable to control the operation of said pawl and ratchet mechanism.

7. A builder motion for operating the traversing rail of a twister frame comprising a pivoted uilder arm, means for operatively connecting v mounted on said arm, means arranged to beoperated by said pawl and ratchet mechanism and said arm with said rail including a slide adjustable lengthwise of said arm, a worm rotatably mounted in said arm, said slide having teeth engageable with said worm whereby the rotation of the. worm moves the slidelongitudinally.

of the arm, and a reversible pawl and ratchet mechanism mounted on said arm and connected with said worm to revolve it in opposite directions, said mechanism being adapted to be driven in opposite directions at will while it remains in its operative positions in the machine.

8. In a twister frame, the combination with a traversing rail and a builder motion comprising a pivoted builder arm, a cam for operating said arm and means for operatively connecting said arm with said rail including a slide adjustable lengthwise of the arm toward and from the pivot for said arm, of a rotary element operatively connected with said slide to adjust it in opposite directions lengthwise of said arm, mechanism for driving said element in opposite directions, and automatic means for throwing said mechanism into and out of operation at predetermined points in the cycle of operations of the machine and while the machine is running.

9. In a twister frame, the combination with a traversing rail and a builder rnotion comprising a pivoted builder arm, a cam for operating said am and means for operatively connecting said arm with said rail including a slide adjustable lengthwise of the arm toward and from the pivot for said arm of a rotary element operatively connected with said slide to adjust it in opposite directions lengthwise of said arm, mechanism for driving said element in opposite directions, and automatic means for holding said mechanism out of operation during a portion of the cycle of operations of the machine and throwing it into operation at a predetermined point in said cycle.

10. In a twister frame, the combination with a traversing rail and a builder motion comprising a pivoted builder arm, a cam for operating said arm and means for operativelyconnecting said arm with said rail including a slide adjustable lengthwise of the arm toward and from the pivot for said arm, of mechanism for adjusting said slide automatically in opposite di rections along said arm to shorten and subsequently lengthen the traverse of said rail, and controlling apparatus for automatically bringing,

v said mechanism into operation at a predetermined point in the cycle of operations of the mawhen the desired yardage has been wound and the latter to bring said slide adjusting mechanism into action at a predetermined point in the cycle of operations of the machine.

12. In a twister frame, the combination with a traversing rail and a builder motion comprising a pivoted builder arm, a cam for operating said arm and means for operatively connecting said arm with said rail including a slide adjustable lengthwise oi' the arm toward and from the pivot for said arm, of a rotary element operatively connected with said slide to adjust it in opposite directions lengthwise of said arm, mechanism for driving said element in opposite directions, automatic means for throwing said mechanism into and out of operation at predetermined points in the cycle of operations of the machine, and parts cooperating with said means and said mechanism to restore said slide to the outer limit of its range of adjustment at the commencement of one portion of the cycle of operations of the machine.

13. A builder motion for operating the traversing rail of a twister frame'comprising a pivoted' said mechanism including means adjustable to vary the extent of the rotative movements so imparted to said element. r

14. In a twister frame, thecombination with a traversing rail and a builder ,motion compris-. "ing a pivoted builder arm, a cam for operating said arm and means foroperatively connecting said am with said rail including a slide adjustable lengthwise of the arm toward and from the pivot for said arm, of a rotary worm mounted on said arm and operatively connected with said slide to adjust it in opposite directions lengthwise of said arm, a pawl and ratchet mechanism mounted on said arm and connected with said worm to revolve it, said mechanism being archin'e while it is running and subsequently throwing saidmechanism outof action again at another predetermined point in said cycle.

11. In a twister frame, the combination with a traversing rail and a builder motion comprisinsa pivoted builder arm, a cam for operating said arm and means for operatively connecting said arm with said rail including a slide adjustable lengthwise oi the arm toward and from the pivot for said arm, of a rotary element operative-.

1y connected with said slide to adjust it in opposite directions lengthwise of said arm, mechanism for driving said element in opposite directions, and automatic means governing the general'operation of the machine including a yardage clock and a builder clock, and apparatus controlled 'by said clocks for enabling the former to shut down the machine automatically ranged to be operated by the swinging movement of said arm and including parts operable automatically to reverse the direction of rotation so transmitted-to said worm.

15. A builder motion for operating the traversing rail of a twister frame comprising a pivoted builder arm, means for operatively connecting said arm with said rail including a'slide ad- Justable lengthwise of said arm, a worm rotatably mounted in said arm, said slide having teeth engageable with said worm whereby the rotation of the wormmoves the slide longitudinally of the arm, a reversible pawl and ratchet mechanism mounted onsaid arm and connected with said worm to revolve it in opposite directions, and a clutch through which said pawl and ratchet mechanism drives said worm, said builder motion including means for operating said clutch automatically in response to predetermined conditions.-

SVEN EDFORS. 

